Revision hip implants and prosthesis systems

Abstract

Revision hip implants and prosthesis systems include femoral heads, cups, screws, bridges, and segmental prostheses for revision surgeries.

1 .- 8 . (canceled) 
     
     
         9 . A modular segmental prosthesis system for supporting an acetabular cup, comprising:
 an inner surface and an outer surface, the inner surface configured to interface with the pelvic bone of the patient, the outer surface facing away from the pelvic bone of the patient, a side of the system extending between the inner and outer surfaces, the side forming a cement fixation area configured to interface with the acetabular cup, the system including a plurality of screw holes extending from the outer surface to the inner surface, the screw holes having a first diameter at the inner surface and a second diameter at the outer surface, the second diameter being greater than the first diameter, the plurality of screw holes having threaded inner surfaces; and   a first screw having a shaft and a head, the shaft of the first screw having a third diameter less than the first diameter of the screw hole, the head having a fourth diameter greater than the first diameter of the screw hole, the shaft of the first screw having threads configured to engage the pelvic bone structure, the head of the first screw having threads formed thereon and configured to engage the threaded inner surfaces of the screws holes.   
     
     
         10 . The modular segmental prosthesis system of  claim 9 , wherein the side defining the cement fixation area further comprises a plurality of spaced protrusions configured to abut against the acetabular cup with bone cement applied between the spaced protrusions and the acetabular cup to cement the prosthesis system to the acetabular cup during a surgical procedure. 
     
     
         11 . A method of performing a revision surgery, comprising:
 introducing a modular segmental prosthesis into a patient, the prosthesis comprising an inner surface and an outer surface, the inner surface configured to interface with a pelvic bone of the patient, the outer surface facing away from the pelvic bone of the patient, a side of the prosthesis extending between the inner and outer surfaces, the side forming a cement fixation area configured to interface with an acetabular cup, the system including a plurality of screw holes formed from the outer surface to the inner surface, the screw holes having a first diameter at the inner surface and a second diameter at the outer surface, the second diameter being greater than the first diameter, the plurality of screw holes having threaded inner surfaces; and   introducing a first screw having a shaft and a head, the shaft of the first screw having a third diameter less than the first diameter of the screw hole, the head of the first screw having a fourth diameter greater than the first diameter of the screw hole, the shaft of the first screw having threads configured to engage the pelvic bone structure, the head of the first screw having threads formed thereon and configured to engage the threaded inner surfaces of the screws holes; and   driving one of the screws into the pelvic bone until the threads on the head engage the threaded inner surface of one of the screw holes such that the prosthesis is secured onto the pelvic bone.   
     
     
         12 . A hard bearing liner for an acetabular cup having a socket with an inner radius, the liner being introducible in a revision surgery, comprising:
 a liner having an inner surface and an outer surface, the liner being sized and shaped for insertion into the inner radius of the acetabular cup, the inner surface being arranged to interface directly with a femoral ball of a prosthetic implant, the outer surface being configured to face the inner radius of the acetabular cup; and   surface features formed on the outer surface of the liner and protruding from the outer surface, the surface features being configured to provide gaps therebetween for accommodating cement, the surface features forming an outer radius substantially matching the inner radius of the socket of the acetabular cup.   
     
     
         13 . The hard bearing liner of  claim 12 , wherein said surface features are formed as a series of rows of alternating semi-cylindrical protrusions and dome protrusions. 
     
     
         14 . The hard bearing liner of  claim 13 , wherein the semi-cylindrical protrusions have about an 8 mm length and a 2 mm height and width, and the dome protrusions have about a 2 mm diameter at their base and a 2 mm height. 
     
     
         15 . The hard bearing liner of  claim 12 , wherein the liner is formed of a material selected from the group consisting of high carbon carbide material; cobalt chromium and a ceramized zirconium.